This study investigates the kinematic behavior of spindle drums designed on the basis
of a planetary – cam – linkage mechanism (PCLM), with a particular focus on elliptical trajectories.
Unlike conventional circular drums, non – circular spindle motion provides an expanded contact zone
with cotton plants, variable spindle spacing, and adaptable speed modes, all of which contribute to
improved harvesting efficiency. The research develops analytical expressions to determine the linear
and angular velocities of spindles operating within elliptical trajectories. The mathematical model
considers geometric parameters such as crank length, lever length, and the major and minor axes of
the ellipse, establishing explicit relationships between spindle position and its velocity modes.
Numerical experiments were conducted to analyze how variations in drum dimensions influence
spindle dynamics. Results show that spindle speed is highly sensitive to changes in the major semi –
axis and lever length, with larger values leading to significant increases in both linear and angular
velocities. Graphical dependencies of spindle kinematic modes confirm that while speeds in the
collection zone are comparable to circular drums, the elliptical configuration enhances the
probability of spindle – boll interactions and facilitates cotton removal. The findings highlight the
advantages of elliptical spindle trajectories and provide recommended design parameters for
developing efficient cotton – harvesting apparatuses, ensuring smoother operation and higher
productivity.
This study investigates the kinematic behavior of spindle drums designed on the basis
of a planetary – cam – linkage mechanism (PCLM), with a particular focus on elliptical trajectories.
Unlike conventional circular drums, non – circular spindle motion provides an expanded contact zone
with cotton plants, variable spindle spacing, and adaptable speed modes, all of which contribute to
improved harvesting efficiency. The research develops analytical expressions to determine the linear
and angular velocities of spindles operating within elliptical trajectories. The mathematical model
considers geometric parameters such as crank length, lever length, and the major and minor axes of
the ellipse, establishing explicit relationships between spindle position and its velocity modes.
Numerical experiments were conducted to analyze how variations in drum dimensions influence
spindle dynamics. Results show that spindle speed is highly sensitive to changes in the major semi –
axis and lever length, with larger values leading to significant increases in both linear and angular
velocities. Graphical dependencies of spindle kinematic modes confirm that while speeds in the
collection zone are comparable to circular drums, the elliptical configuration enhances the
probability of spindle – boll interactions and facilitates cotton removal. The findings highlight the
advantages of elliptical spindle trajectories and provide recommended design parameters for
developing efficient cotton – harvesting apparatuses, ensuring smoother operation and higher
productivity.
| № | Muallifning F.I.Sh. | Lavozimi | Tashkilot nomi |
|---|---|---|---|
| 1 | Ravutov . . | PhD, Associate Professor | Tashkent State Technical University |
| 2 | Rajapbayev U.A. | PhD student, | Tashkent Institute of Irrigation and Agricultural Mechanization Engineers (TIIAME)-National Research University |
| 3 | Ruzmetov .E. | Researcher | Tashkent State Technical University |
| 4 | Tojiboyev S.. | PhD, Associate Professor | Tashkent State Technical University |
| 5 | Ruziboyev R. . | Masters Student, | Tashkent State Technical University |
| № | Havola nomi |
|---|---|
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| 4 | 11. Khurramov SR, Abdukarimov A, Khalturaev FS, Kurbanova FZ. (2021) Modeling the shape of the roll contact curves in two-roll modules. ICEMP 2021, Journal of Physics: Conference Series, 1789, 012008. https://doi.org/10.1088/1742-6596/1789/1/012008 12. Khurramov SR, Abdukarimov A, Khalturaev FS, Kurbanova FZ. (2021) Modeling the shape of the roll contact curves in two-roll modules. ICEMP 2021, Journal of Physics: Conference Series, 1789, 012008. https://doi.org/10.1088/1742-6596/1789/1/012008 13. Karimov KA. (1986) Planetary friction mechanisms with variable carrier length. Monograph, Tashkent: Fan, 107 p. |
| 5 | 14. Turanov K, Abdazimov A, Shaumarova M, Siddikov S. (2021) Mathematical modeling of a multiloop coulisse mechanism of a vertical spindle cotton harvester. In: Murgul V, Pukhkal V, editors. International Scientific Conference Energy Management of Municipal Facilities and Sustainable Energy Technologies (EMMFT 2019). Advances in Intelligent Systems and Computing, Springer, Cham, 1258:306–321. https://doi.org/10.1007/978-3-030- 57450-5_28 15. Khurramov S.R, Abdukarimov A, Khalturaev F.S, Kurbanova F.Z. (2020) Modeling of friction forces in an asymmetric two-roll module. ModTech 2020, IOP Publishing, IOP Conf. Series: Materials Science and Engineering, 916, 012051, 1-8. https://doi.org/10.1088/1757-899X/916/1/012051 |